用C#改写Head First Design Patterns--Command 命令（原创）

用一个控制器（带有几个开关）来控制所有的电器？神奇而简单的实现：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Command
{
public interface Command
{
void execute();
void execute1();

void execute2();
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Command
{
/// <summary>
/// 电灯类
/// </summary>
public class Light
{
public Light(){}

public void on()
{
System.Console.WriteLine("开灯");
}

public void off()
{
System.Console.WriteLine("关灯");
}
}

/// <summary>
/// 电视类,具有不同的方法
/// </summary>
public class TV
{
public TV() { }

public void open()
{
System.Console.WriteLine("开电视");
}

public void close()
{
System.Console.WriteLine("关电视");
}

public void changeChannel()
{
System.Console.WriteLine("换台");
}

public void setVolume(int i)
{
System.Console.WriteLine("控制音量"+i.ToString());
}

}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Command
{
public class LightCommands : Command
{
Light light;

public LightCommands(Light l)
{
this.light = l;
}

#region Command 成员

public void execute()
{
light.on();
}

void Command.execute1()
{
light.off();
}

//啥也不做!
void Command.execute2()
{
//throw new NotImplementedException();

}

#endregion
}

public class TVCommands : Command
{
TV tv;

public TVCommands(TV tv)
{
this.tv = tv;
}

#region Command 成员

public void execute()
{
tv.open();
}

void Command.execute1()
{
tv.close();
}

/// <summary>
/// 特别的操作:换台
/// </summary>
void Command.execute2()
{
tv.changeChannel();
}

#endregion
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Command
{

/// <summary>
/// 遥控器,要把它作为万能的控制中心
/// </summary>
public class ControlCenter
{
Command com;

public ControlCenter() { }

public void setCommand(Command c)
{
this.com = c;
}

public void firstButtonPressed()
{
com.execute();
}

public void secondButtonPressed()
{
com.execute1();
}

/// <summary>
/// 特殊的按钮,用于处理特别需求
/// </summary>
public void SpecButtonPressed()
{
com.execute2();
}

}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Command
{
class Program
{
static void Main(string[] args)
{
ControlCenter cc = new ControlCenter();

Light l=new Light();
Command c = new LightCommands(l);

TV t = new TV();
Command c1 = new TVCommands(t);

cc.setCommand(c);
cc.firstButtonPressed();
cc.SpecButtonPressed();
cc.secondButtonPressed();
cc.setCommand(c1);
cc.firstButtonPressed();
cc.SpecButtonPressed();
cc.secondButtonPressed();

System.Console.ReadLine();
}
}
}